El conocimiento del punto de autoignición de los motores bajo combustión HCCI es un apartado fundamental en el futuro desarrollo de estos motores. En este trabajo tratamos de proporcionar una herramienta computacional, con un detallado estudio de la cinética química, la cual resulta imprescindible para la compresión del fenómeno HCCI ; This paper reviews some of the engine research results and available data from HCCI combustion kinetics studies. Homogeneous Charge Compression Ignition (HCCI) combustion has recently emerged as a viable alternative combustion process to the conventional spark ignition or compression ignition process for internal combustion engines, owing too its potential for high efficiency and extremely low NOx and particulate emissions. Methods for automatic quasi-steady-state reduction of reaction mechanisms a life time measure to detect equilibrated species has been developed and applied to homogeneous model of HCCI engine fuelled with its two fuels.